See also: 1926 in Australia, other events of 1927, 1928 in Australia and the Timeline of Australian history.
Parliament House Opening, 1927
- 1 February – The North Australia Act of 1926 is enforced and the territory of Central Australia is created.
- 8 February – A cyclone makes landfall north of Cairns, causing flooding at Halifax Bay, Ingham, Innisfail, Tully, Cardwell and Townsville. Thirty-six people are killed, and twenty are missing.
- 9 April – A general election is held in Victoria.
- 3 May – The Australasian Council of Trade Unions is formed at the All-Australian Trade Union Congress in Melbourne.
- 9 May – Parliament House in Canberra is officially opened by the Duke of York.
- 20 May – Following a swing to the ALP in the Victorian election, Edmond Hogan forms a minority Labor government with Progressive support, and takes over as Premier of Victoria from John Allan.
- 29 June – Charles Kingsford Smith and his copilot Charles Ulm complete a round-Australia flight in ten days, five-and-a-half hours.
- 27 October – Melbourne gangster Squizzy Taylor is killed in a shootout with Sydney gangsters (including Snowy Cutmore, who also dies) in Carlton.
- 3 November – The Sydney ferry Greycliffe is cut in half by the liner RMS Tahiti, killing 40 persons.
Science and technology
Arts and literature
- 20 January – Dawn Lake, entertainer (died 2006)
- 21 January – Clive Churchill, rugby league player (died 1985)
- 20 March – Wally Grout, cricket player (died 1968)
- 1 April – Peter Cundall, horticulturist and television presenter
- 6 June – Alan Seymour, playwright
- 13 June – David Kirkpatrick (Slim Dusty), country and western singer (died 2003)
- 13 July – Ian Reed, discus thrower
- 14 August – Sid Patterson, cyclist (died 1999)
- 29 October – Frank Sedgman, tennis player
- 14 November – Bart Cummings, Australia's Best Racehorse Trainer (12 Melbourne Cups at the time of writing)
- 28 December – Ron Casey, Australian rules football administrator and media personality (died 2000)